src/mc/mc_smx.cpp

   1 /* Copyright (c) 2015. The SimGrid Team.
   2  * All rights reserved.                                                     */
   3
   4 /* This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the license (GNU LGPL) which comes with this package. */
   6
   7 #include <assert.h>
   8
   9 #include <xbt/log.h>
  10
  11 #include "simix/smx_private.h"
  12
  13 #include "mc_smx.h"
  14 #include "mc_model_checker.h"
  15
  16 extern "C" {
  17
  18 static
  19 void MC_smx_process_info_clear(mc_smx_process_info_t p)
  20 {
  21   p->hostname = NULL;
  22
  23   xbt_mheap_t heap = mmalloc_set_current_heap(mc_heap);
  24   free(p->name);
  25   mmalloc_set_current_heap(heap);
  26
  27   p->name = NULL;
  28 }
  29
  30 xbt_dynar_t MC_smx_process_info_list_new(void)
  31 {
  32   return xbt_dynar_new(
  33     sizeof(s_mc_smx_process_info_t),
  34     ( void_f_pvoid_t) &MC_smx_process_info_clear);
  35 }
  36
  37 static inline
  38 bool is_in_dynar(smx_process_t p, xbt_dynar_t dynar)
  39 {
  40   return (uintptr_t) p >= (uintptr_t) dynar->data
  41     && (uintptr_t) p < ((uintptr_t) dynar->data + dynar->used * dynar->elmsize);
  42 }
  43
  44 static inline
  45 mc_smx_process_info_t MC_smx_process_get_info(smx_process_t p)
  46 {
  47   assert(is_in_dynar(p, mc_model_checker->process.smx_process_infos)
  48     || is_in_dynar(p, mc_model_checker->process.smx_old_process_infos));
  49   mc_smx_process_info_t process_info =
  50     (mc_smx_process_info_t)
  51       ((char*) p - offsetof(s_mc_smx_process_info_t, copy));
  52   return process_info;
  53 }
  54
  55 /** Load the remote swag of processes into a dynar
  56  *
  57  *  @param process     MCed process
  58  *  @param target      Local dynar (to be filled with copies of `s_smx_process_t`)
  59  *  @param remote_swag Address of the process SWAG in the remote list
  60  */
  61 static void MC_process_refresh_simix_process_list(
  62   mc_process_t process,
  63   xbt_dynar_t target, xbt_swag_t remote_swag)
  64 {
  65   // swag = REMOTE(*simix_global->process_list)
  66   s_xbt_swag_t swag;
  67   MC_process_read(process, MC_PROCESS_NO_FLAG, &swag, remote_swag, sizeof(swag),
  68     MC_PROCESS_INDEX_ANY);
  69
  70   smx_process_t p;
  71   xbt_dynar_reset(target);
  72
  73   // Load each element of the dynar from the MCed process:
  74   int i = 0;
  75   for (p = (smx_process_t) swag.head; p; ++i) {
  76
  77     s_mc_smx_process_info_t info;
  78     info.address = p;
  79     info.name = NULL;
  80     info.hostname = NULL;
  81     MC_process_read(process, MC_PROCESS_NO_FLAG,
  82       &info.copy, p, sizeof(info.copy), MC_PROCESS_INDEX_ANY);
  83     xbt_dynar_push(target, &info);
  84
  85     // Lookup next process address:
  86     p = (smx_process_t) xbt_swag_getNext(&info.copy, swag.offset);
  87   }
  88   assert(i == swag.count);
  89 }
  90
  91 void MC_process_smx_refresh(mc_process_t process)
  92 {
  93   if (process->cache_flags & MC_PROCESS_CACHE_FLAG_SIMIX_PROCESSES)
  94     return;
  95
  96   xbt_mheap_t heap = mmalloc_set_current_heap(mc_heap);
  97
  98   // TODO, avoid to reload `&simix_global`, `simix_global`, `*simix_global`
  99
 100   // simix_global_p = REMOTE(simix_global);
 101   smx_global_t simix_global_p;
 102   MC_process_read_variable(process, "simix_global", &simix_global_p, sizeof(simix_global_p));
 103
 104   // simix_global = REMOTE(*simix_global)
 105   s_smx_global_t simix_global;
 106   MC_process_read(process, MC_PROCESS_NO_FLAG, &simix_global, simix_global_p, sizeof(simix_global),
 107     MC_PROCESS_INDEX_ANY);
 108
 109   MC_process_refresh_simix_process_list(
 110     process, process->smx_process_infos, simix_global.process_list);
 111   MC_process_refresh_simix_process_list(
 112     process, process->smx_old_process_infos, simix_global.process_to_destroy);
 113
 114   process->cache_flags |= MC_PROCESS_CACHE_FLAG_SIMIX_PROCESSES;
 115   mmalloc_set_current_heap(heap);
 116 }
 117
 118 /** Get the issuer of a simcall (`req->issuer`)
 119  *
 120  *  In split-process mode, it does the black magic necessary to get an address
 121  *  of a (shallow) copy of the data structure the issuer SIMIX process in the local
 122  *  address space.
 123  *
 124  *  @param process the MCed process
 125  *  @param req     the simcall (copied in the local process)
 126  */
 127 smx_process_t MC_smx_simcall_get_issuer(smx_simcall_t req)
 128 {
 129   if (MC_process_is_self(&mc_model_checker->process))
 130     return req->issuer;
 131
 132   MC_process_smx_refresh(&mc_model_checker->process);
 133
 134   // This is the address of the smx_process in the MCed process:
 135   void* address = req->issuer;
 136
 137   unsigned i;
 138   mc_smx_process_info_t p;
 139
 140   // Lookup by address:
 141   xbt_dynar_foreach_ptr(mc_model_checker->process.smx_process_infos, i, p)
 142     if (p->address == address)
 143       return &p->copy;
 144   xbt_dynar_foreach_ptr(mc_model_checker->process.smx_old_process_infos, i, p)
 145     if (p->address == address)
 146       return &p->copy;
 147
 148   xbt_die("Issuer not found");
 149 }
 150
 151 smx_process_t MC_smx_resolve_process(smx_process_t process_remote_address)
 152 {
 153   if (!process_remote_address)
 154     return NULL;
 155   if (MC_process_is_self(&mc_model_checker->process))
 156     return process_remote_address;
 157
 158   mc_smx_process_info_t process_info = MC_smx_resolve_process_info(process_remote_address);
 159   if (process_info)
 160     return &process_info->copy;
 161   else
 162     return NULL;
 163 }
 164
 165 mc_smx_process_info_t MC_smx_resolve_process_info(smx_process_t process_remote_address)
 166 {
 167   if (MC_process_is_self(&mc_model_checker->process))
 168     xbt_die("No process_info for local process is not enabled.");
 169
 170   unsigned index;
 171   mc_smx_process_info_t process_info;
 172   xbt_dynar_foreach_ptr(mc_model_checker->process.smx_process_infos, index, process_info)
 173     if (process_info->address == process_remote_address)
 174       return process_info;
 175   xbt_dynar_foreach_ptr(mc_model_checker->process.smx_old_process_infos, index, process_info)
 176     if (process_info->address == process_remote_address)
 177       return process_info;
 178   xbt_die("Process info not found");
 179 }
 180
 181 const char* MC_smx_process_get_host_name(smx_process_t p)
 182 {
 183   if (MC_process_is_self(&mc_model_checker->process))
 184     return SIMIX_host_get_name(p->smx_host);
 185
 186   mc_process_t process = &mc_model_checker->process;
 187
 188   // Currently, smx_host_t = xbt_dictelm_t.
 189   // TODO, add an static_assert on this if switching to C++
 190   // The host name is host->key and the host->key_len==strlen(host->key).
 191   s_xbt_dictelm_t host_copy;
 192   mc_smx_process_info_t info = MC_smx_process_get_info(p);
 193   if (!info->hostname) {
 194
 195     // Read the hostname from the MCed process:
 196     MC_process_read_simple(process, &host_copy, p->smx_host, sizeof(host_copy));
 197     int len = host_copy.key_len + 1;
 198     char hostname[len];
 199     MC_process_read_simple(process, hostname, host_copy.key, len);
 200
 201     // Lookup the host name in the dictionary (or create it):
 202     xbt_dictelm_t elt = xbt_dict_get_elm_or_null(mc_model_checker->hosts, hostname);
 203     if (!elt) {
 204       xbt_mheap_t heap = mmalloc_set_current_heap(mc_heap);
 205       xbt_dict_set(mc_model_checker->hosts, hostname, NULL, NULL);
 206       elt = xbt_dict_get_elm_or_null(mc_model_checker->hosts, hostname);
 207       assert(elt);
 208       mmalloc_set_current_heap(heap);
 209     }
 210
 211     info->hostname = elt->key;
 212   }
 213   return info->hostname;
 214 }
 215
 216 const char* MC_smx_process_get_name(smx_process_t p)
 217 {
 218   mc_process_t process = &mc_model_checker->process;
 219   if (MC_process_is_self(process))
 220     return p->name;
 221   if (!p->name)
 222     return NULL;
 223
 224   mc_smx_process_info_t info = MC_smx_process_get_info(p);
 225   if (!info->name) {
 226     xbt_mheap_t heap = mmalloc_set_current_heap(mc_heap);
 227     info->name = MC_process_read_string(process, p->name);
 228     mmalloc_set_current_heap(heap);
 229   }
 230   return info->name;
 231 }
 232
 233 int MC_smpi_process_count(void)
 234 {
 235   if (MC_process_is_self(&mc_model_checker->process))
 236     return smpi_process_count();
 237   else {
 238     int res;
 239     MC_process_read_variable(&mc_model_checker->process, "process_count",
 240       &res, sizeof(res));
 241     return res;
 242   }
 243 }
 244
 245 }